3 basic ways to check NVIDIA hardware in Linux
Assuming your NVIDIA driver is properly installed and functioning.
Detect NVIDIA GPU(s): ‘nvidia-smi’
Detect NVLink(s) (if you have them installed): ‘nvidia-smi nvlink --status -i’
Detect physically installed devices that includes ‘nvidia’: ‘lspci | grep -i nvidia’
If your NVIDIA driver states that it is having issues communicating with your installed hardware, then you most likely need to re-install your NVIDIA driver.